The New Orleans Police Department is looking for two more individuals who may have “critical information” related to Sunday’s shooting on Bourbon Street.

The city released four infrared still photos and asked that anyone who can help identify those pictured to get in touch with police.

In an email, Mayor Mitch Landrieu’s spokesman, Tyler Gamble, noted that the low-light cameras used to take the photos have changed the colors of the T-shirts the individuals were wearing.

Neither individual is a suspect, Gamble said, adding, “They are persons of interest who may have information which may assist detectives in this investigation.”

Anyone with information on their identities or whereabouts is asked to call the NOPD at (504) 658-5300 or anonymously at Crimestoppers at (504) 822-1111.